DMTO device low pressure deaerator exhaust steam recovery system

Abstract

The utility model discloses a DMTO device low pressure oxygen eliminator discharges the recovery system of weak steam, including oxygen eliminator, the top of oxygen eliminator is connected with weak steam recovery external discharge unit, and the end of weak steam recovery external discharge unit is connected with the mixing unit away from oxygen eliminator, and the mixing unit is connected with negative pressure power component, and the mixing unit is connected with recovery mechanism, and recovery mechanism is connected with oxygen eliminator through conveying component. The utility model carries out all recycling utilization to the weak steam of external discharge low -level heat energy, and preheats a part of oxygen eliminator feed desalted water simultaneously, avoids the waste of weak steam, and effectively reduces the operation cost of device.

Description

Technical Field

[0001] This utility model belongs to the technical field of waste steam recovery systems, specifically relating to a waste steam recovery system for the low-pressure deaerator of a DMTO unit. Background Technology

[0002] As the core equipment of coal-to-olefins technology, the DMTO unit occupies a pivotal position in my country's coal chemical industry. It successfully transforms my country's abundant coal resources into basic organic chemical raw materials, opening up new raw material routes for the chemical industry, effectively alleviating my country's dependence on oil imports, and playing a significant role in ensuring national energy security and promoting stable economic development. After years of development, DMTO technology has been continuously upgraded, with the production scale and efficiency of the unit constantly improving, making it one of the landmark technologies in my country's modern coal chemical industry.

[0003] The DMTO unit employs a film deaerator, which primarily uses low-pressure steam (190℃, 0.45MPa) to heat the demineralized water to its saturation temperature corresponding to the deaerator's operating pressure. This removes dissolved oxygen and other gases from the water, producing deoxygenated water (dissolved oxygen ≤15μg / L) for production use. The oxygen-rich exhaust steam is then directly released into the atmosphere. Since the DMTO unit's deaerator is a continuously operating device, this low-grade heat exhaust steam has high recovery and utilization value. Direct discharge not only wastes resources but also increases the deaerator's operating costs. Utility Model Content

[0004] The purpose of this invention is to provide a waste steam recovery system for the low-pressure deaerator of a DMTO unit, which can effectively recover and utilize low-grade heat energy waste steam.

[0005] The technical solution adopted in this utility model is a waste steam recovery system for a low-pressure deaerator of a DMTO device, including a deaerator, a waste steam recovery and exhaust unit connected to the top of the deaerator, a mixing unit connected to the end of the waste steam recovery and exhaust unit away from the deaerator, a negative pressure power component connected to the mixing unit, a recovery mechanism connected to the mixing unit, and the recovery mechanism connected to the deaerator through a conveying component.

[0006] The features of this utility model also include: The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe, which is connected to the top of the deaerator. The exhaust steam discharge pipe is connected to an exhaust steam recovery pipe, which is connected to the mixing unit.

[0007] The waste steam recovery pipe is connected to a waste steam recovery shut-off valve, and the waste steam discharge pipe is connected to an exhaust waste steam shut-off valve. The connection point between the waste steam recovery pipe and the waste steam discharge pipe is located between the exhaust waste steam shut-off valve and the deaerator. The waste steam recovery shut-off valve is located near the connection point between the waste steam recovery pipe and the waste steam discharge pipe.

[0008] The mixing unit includes a demineralized water ejector, the inlet end of which is connected to a waste steam recovery pipe. The waste steam recovery pipe is also connected to a waste steam inlet valve, which is located near the demineralized water ejector. The inlet end of the demineralized water ejector is connected to a negative pressure power assembly, and the demineralized water ejector is connected to a recovery mechanism.

[0009] The negative pressure power assembly includes a demineralized water pipe, which is connected to the inlet end of the demineralized water ejector. A demineralized water inlet valve is connected to the body of the demineralized water pipe and is located near the demineralized water ejector.

[0010] The recycling facility includes a recycling tank, which is connected to a demineralized water injector via a recycling pipe, and the recycling tank is connected to a conveying assembly via an output pipe.

[0011] The recovery pipe is connected to a premixed outlet valve and a condensate recovery valve. The premixed outlet valve is located near the demineralized water ejector, and the condensate recovery valve is connected near the recovery storage tank. The output pipe is connected to a pump inlet valve.

[0012] An overflow pipe is connected to the side wall of the recycling tank, and an overflow valve is connected to the body of the overflow pipe. A minimum flow pipe is connected to the top of the recycling tank, and the end of the minimum flow pipe away from the recycling tank is connected to the conveying assembly. A minimum flow return valve is connected to the body of the minimum flow pipe, and an atmospheric pipe is connected to the top of the recycling tank.

[0013] The conveying assembly includes a water pump connected to an output pipe, a condensate return main pipe connected to the outlet of the water pump, a minimum flow pipe connected to the body of the condensate return main pipe, and a deaerator connected to the end of the condensate return main pipe furthest from the water pump.

[0014] The condensate return main pipe is connected to a pump outlet flow control valve and a condensate to deaerator inlet valve. The pump outlet flow control valve and the condensate to deaerator inlet valve are located between the deaerator and the connection point of the condensate return main pipe and the minimum flow pipe. The condensate to deaerator inlet valve is located close to the deaerator, and the pump outlet flow control valve is located close to the connection point of the condensate return main pipe and the minimum flow pipe.

[0015] The beneficial effects of this utility model are: This utility model relates to a low-pressure deaerator exhaust steam recovery system for DMTO (Digital Deaerator-Oxygenation) units. It fully recovers and reuses the exhaust steam containing low-grade heat energy, while simultaneously preheating a portion of the deaerator feed demineralized water, thus preventing steam waste and effectively reducing the unit's operating costs. During operation, the recovery system boasts low maintenance costs and high recovery efficiency. Furthermore, from an environmental perspective, it addresses the noise hazards caused by on-site exhaust steam emissions, optimizing the unit's operating environment. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the exhaust steam recovery system of the low-pressure deaerator in the DMTO device of this utility model.

[0017] In the diagram: 1. Deaerator, 11. Exhaust steam exhaust pipe, 12. Exhaust steam recovery pipe, 101. Exhaust steam shut-off valve, 102. Exhaust steam recovery shut-off valve, 2. Demineralized water ejector, 21. Demineralized water pipe, 201. Demineralized water inlet valve, 202. Exhaust steam inlet valve, 203. Premixed outlet valve, 3. Recovery tank, 31. Recovery pipe, 32. Output pipe, 33. Overflow pipe, 34. Minimum flow pipe, 35. Atmospheric pipe, 301. Condensate recovery valve, 302. Minimum flow return valve, 303. Pump inlet valve, 304. Overflow valve, 4. Water pump, 41. Condensate return main pipe, 401. Pump outlet flow control valve, 402. Condensate to deaerator inlet valve. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This utility model relates to a low-pressure deaerator exhaust steam recovery system for DMTO devices, such as... Figure 1 As shown, the system includes a deaerator 1, with a waste steam recovery and exhaust unit connected to its top. A mixing unit is connected to the end of the waste steam recovery and exhaust unit furthest from the deaerator 1. The mixing unit is connected to a negative pressure power assembly and a recovery mechanism, which is connected to the deaerator 1 via a conveying assembly. The system allows for switching between waste steam recovery and exhaust according to production needs. The waste steam generated by the deaerator 1 enters the mixing unit through the waste steam recovery and exhaust unit, where it mixes with the demineralized water from the negative pressure power assembly. The demineralized water is heated, and the waste steam and demineralized water form a mixed condensate that enters the recovery mechanism and then, via the conveying assembly, returns to the deaerator 1 for reuse.

[0020] Example 1 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0021] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit. The exhaust steam generated by the deaerator 1 enters the mixing unit for recovery through the exhaust steam recovery pipe 12, and the exhaust steam generated after the recovery reaction is discharged through the exhaust steam discharge pipe 11.

[0022] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11. Closing the waste steam discharge shut-off valve 101 and opening the waste steam recovery shut-off valve 102 ensures that the waste steam flows through the mixing unit, allowing the waste steam to enter the mixing unit, i.e., the demineralized water ejector 2.

[0023] Example 2 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0024] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit.

[0025] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11.

[0026] The mixing unit includes a demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the waste steam recovery pipe 12. The waste steam recovery pipe 12 is also connected to a waste steam inlet valve 202, which is located close to the demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the negative pressure power assembly, and the demineralized water ejector 2 is connected to the recovery mechanism. Opening the waste steam recovery shut-off valve 102 and the waste steam inlet valve 202 ensures that the waste steam and the demineralized water ejector 2 are in continuous flow, allowing the waste steam to enter the demineralized water ejector 2 through the waste steam recovery pipe 12.

[0027] Example 3 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0028] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit.

[0029] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11.

[0030] The mixing unit includes a demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the waste steam recovery pipe 12. The body of the waste steam recovery pipe 12 is also connected to a waste steam inlet valve 202. The waste steam inlet valve 202 is located close to the demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the negative pressure power assembly. The demineralized water ejector 2 is connected to the recovery mechanism.

[0031] The negative pressure power assembly includes a demineralized water pipe 21, which is connected to the inlet end of the demineralized water ejector 2. A demineralized water inlet valve 201 is connected to the body of the demineralized water pipe 21 and is located close to the demineralized water ejector 2. When the demineralized water inlet valve 201 is opened, demineralized water enters the demineralized water ejector 2. The demineralized water serves as the power source for creating negative pressure. When the demineralized water ejector 2 is operating normally, a negative pressure zone is generated at the inlet side of the ejector, and the exhaust steam is stably drawn into the demineralized water ejector 2.

[0032] The recovery mechanism includes a recovery storage tank 3, which is connected to the demineralized water ejector 2 via a recovery pipe 31. The recovery storage tank 3 is also connected to the conveying assembly via an output pipe 32. Exhaust steam and demineralized water from the power source are mixed and condensed in contact. The premixed condensate enters the recovery storage tank 3. The opening degree of the demineralized water inlet valve 201 can control the temperature of the premixed outlet, ensuring that the temperature meets production requirements.

[0033] Example 4 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0034] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit.

[0035] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11.

[0036] The mixing unit includes a demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the waste steam recovery pipe 12. The body of the waste steam recovery pipe 12 is also connected to a waste steam inlet valve 202. The waste steam inlet valve 202 is located close to the demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the negative pressure power assembly. The demineralized water ejector 2 is connected to the recovery mechanism.

[0037] The negative pressure power assembly includes a demineralized water pipe 21, which is connected to the inlet end of the demineralized water ejector 2. A demineralized water inlet valve 201 is connected to the body of the demineralized water pipe 21, and the demineralized water inlet valve 201 is located close to the demineralized water ejector 2.

[0038] The recycling mechanism includes a recycling tank 3, which is connected to a demineralized water injector 2 via a recycling pipe 31, and is connected to a conveying assembly via an output pipe 32.

[0039] The recovery pipe 31 is connected to a premixed outlet valve 203 and a condensate recovery valve 301. The premixed outlet valve 203 is located near the demineralized water ejector 2, and the condensate recovery valve 301 is connected near the recovery storage tank 3. The output pipe 32 is connected to a pump inlet valve 303. When the premixed condensate enters the recovery storage tank 3, the premixed outlet valve 203 and the condensate recovery valve 301 need to be opened.

[0040] Example 5 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0041] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit.

[0042] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11.

[0043] The mixing unit includes a demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the waste steam recovery pipe 12. The body of the waste steam recovery pipe 12 is also connected to a waste steam inlet valve 202. The waste steam inlet valve 202 is located close to the demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the negative pressure power assembly. The demineralized water ejector 2 is connected to the recovery mechanism.

[0044] The negative pressure power assembly includes a demineralized water pipe 21, which is connected to the inlet end of the demineralized water ejector 2. A demineralized water inlet valve 201 is connected to the body of the demineralized water pipe 21, and the demineralized water inlet valve 201 is located close to the demineralized water ejector 2.

[0045] The recycling mechanism includes a recycling tank 3, which is connected to a demineralized water injector 2 via a recycling pipe 31, and is connected to a conveying assembly via an output pipe 32.

[0046] The body of the recovery pipe 31 is connected to a premixed outlet valve 203 and a condensate recovery valve 301. The premixed outlet valve 203 is located near the demineralized water ejector 2, and the condensate recovery valve 301 is connected near the recovery storage tank 3. The body of the output pipe 32 is connected to a pump inlet valve 303.

[0047] An overflow pipe 33 is connected to the side wall of the recovery tank 3, and an overflow valve 304 is connected to the body of the overflow pipe 33. A minimum flow pipe 34 is connected to the top of the recovery tank 3, and the end of the minimum flow pipe 34 away from the recovery tank 3 is connected to the conveying assembly. A minimum flow return valve 302 is connected to the body of the minimum flow pipe 34. An atmospheric pipe 35 is connected to the top of the recovery tank 3. The recovery tank 3 is connected to the atmosphere through the atmospheric pipe 35, and there is a height difference between it and the demineralized water ejector 2, which ensures that condensate water enters the recovery tank 3 stably. The recovery tank 3 is equipped with an overflow pipe 33, which maintains the liquid level at a certain level.

[0048] Example 6 The DMTO unit's low-pressure deaerator exhaust steam recovery system includes a deaerator 1, a exhaust steam recovery and discharge unit connected to the top of the deaerator 1, a mixing unit connected to the end of the exhaust steam recovery and discharge unit away from the deaerator 1, a negative pressure power assembly connected to the mixing unit, and a recovery mechanism connected to the mixing unit. The recovery mechanism is connected to the deaerator 1 via a conveying assembly.

[0049] The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe 11, which is connected to the top of the deaerator 1. An exhaust steam recovery pipe 12 is connected to the body of the exhaust steam discharge pipe 11, and the exhaust steam recovery pipe 12 is connected to the mixing unit.

[0050] The waste steam recovery pipe 12 is connected to a waste steam recovery shut-off valve 102, and the waste steam discharge pipe 11 is connected to a waste steam discharge shut-off valve 101. The connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11 is located between the waste steam discharge shut-off valve 101 and the deaerator 1. The waste steam recovery shut-off valve 102 is located near the connection point between the waste steam recovery pipe 12 and the waste steam discharge pipe 11.

[0051] The mixing unit includes a demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the waste steam recovery pipe 12. The body of the waste steam recovery pipe 12 is also connected to a waste steam inlet valve 202. The waste steam inlet valve 202 is located close to the demineralized water ejector 2. The inlet end of the demineralized water ejector 2 is connected to the negative pressure power assembly. The demineralized water ejector 2 is connected to the recovery mechanism.

[0052] The negative pressure power assembly includes a demineralized water pipe 21, which is connected to the inlet end of the demineralized water ejector 2. A demineralized water inlet valve 201 is connected to the body of the demineralized water pipe 21, and the demineralized water inlet valve 201 is located close to the demineralized water ejector 2.

[0053] The recycling mechanism includes a recycling tank 3, which is connected to a demineralized water injector 2 via a recycling pipe 31, and is connected to a conveying assembly via an output pipe 32.

[0054] The body of the recovery pipe 31 is connected to a premixed outlet valve 203 and a condensate recovery valve 301. The premixed outlet valve 203 is located near the demineralized water ejector 2, and the condensate recovery valve 301 is connected near the recovery storage tank 3. The body of the output pipe 32 is connected to a pump inlet valve 303.

[0055] An overflow pipe 33 is connected to the side wall of the recycling tank 3, and an overflow valve 304 is connected to the body of the overflow pipe 33. A minimum flow pipe 34 is connected to the top of the recycling tank 3, and the end of the minimum flow pipe 34 away from the recycling tank 3 is connected to the conveying assembly. A minimum flow return valve 302 is connected to the body of the minimum flow pipe 34. An atmospheric pipe 35 is connected to the top of the recycling tank 3.

[0056] The conveying assembly includes a water pump 4, which is connected to an output pipe 32. The outlet of the water pump 4 is connected to a condensate return main pipe 41. The minimum flow pipe 34 is connected to the pipe body of the condensate return main pipe 41. The end of the condensate return main pipe 41 away from the water pump 4 is connected to the deaerator 1.

[0057] The condensate return main pipe 41 is connected to a pump outlet flow control valve 401 and a condensate to deaerator inlet valve 402. These valves are located between the deaerator 1 and the connection point between the condensate return main pipe 41 and the minimum flow pipe 34. The condensate to deaerator inlet valve 402 is positioned close to the deaerator 1, and the pump outlet flow control valve 401 is positioned close to the connection point between the condensate return main pipe 41 and the minimum flow pipe 34. When the liquid level in the recovery storage tank 3 reaches 50%, a portion of the condensate is returned to the recovery storage tank 3 via the water pump 4 through the minimum flow pipe 34 to prevent the pump from running dry due to a low liquid level. The remaining portion is sent to the condensate return main pipe 41 via the pump outlet flow control valve 401 and then enters the deaerator 1 through the condensate to deaerator inlet valve 402 for recycling.

[0058] The working principle of the exhaust steam recovery system of the low-pressure deaerator in this DMTO device is as follows: The exhaust valve at the highest point of deaerator 1 is connected to the exhaust steam discharge pipe 11 and the exhaust steam recovery pipe 12. Both pipes are equipped with shut-off valves, which can switch between exhaust steam recovery and discharge according to production needs. The exhaust steam recovery pipe 12 and the demineralized water pipe 21 are connected to the inlet end of the demineralized water ejector 2. The demineralized water ejection forms a negative pressure zone to guide the exhaust steam and mix it with the demineralized water. The demineralized water is heated and the exhaust steam is cooled to form mixed condensate. It is connected to the recovery storage tank 3 through the premixed outlet valve 203. The condensate in the recovery storage tank 3 is sent to the condensate return main pipe 41 by the water pump 4 using the pump outlet flow valve 401 and the automatic control of the liquid level in the recovery storage tank. It is then reused in deaerator 1. The minimum flow pipe 34 at the outlet of the water pump 4 is connected to the top of the recovery storage tank 3 to ensure the stable operation of the water pump 4.

[0059] Close the exhaust steam shut-off valve 101, open the exhaust steam recovery shut-off valve 102, and open the demineralized water inlet valve 201 to create a negative pressure on the exhaust steam inlet side of the demineralized water ejector 2. After the exhaust steam enters the demineralized water ejector 2 and mixes with the demineralized water through heat exchange, the condensate enters the recovery storage tank 3 from the premixed outlet valve 203. This part of the condensate is pressurized by the water pump 4 and returned to the deaerator 1 from the condensate return main pipe 41 for utilization.

[0060] This utility model relates to a low-pressure deaerator exhaust steam recovery system for DMTO (Deionization-Oxygenation-Transfer) units. It utilizes a self-supplying demineralized water system via an ejector to create a negative pressure zone, where it mixes thoroughly with the exhaust steam generated by the deaerator. The system absorbs the low-grade heat energy of the exhaust steam. The demineralized water and exhaust steam condense and mix in the ejector, while simultaneously using the low-grade heat energy of the exhaust steam to preheat the demineralized water. After condensation, the exhaust steam, along with the heat-absorbing demineralized water, is returned to the deaerator for reuse. This effectively reduces the operating costs of the unit and achieves energy conservation and consumption reduction. From an environmental perspective, this recovery system solves the noise pollution caused by on-site exhaust steam emissions and optimizes the unit's operating environment.

Claims

1. A waste steam recovery system for the low-pressure deaerator of a DMTO unit, characterized in that, Includes a deaerator (1), the top of which is connected to a waste steam recovery and exhaust unit, the end of which is away from the deaerator (1) is connected to a mixing unit, the mixing unit is connected to a negative pressure power assembly, the mixing unit is connected to a recovery mechanism, and the recovery mechanism is connected to the deaerator (1) via a conveying assembly.

2. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 1, characterized in that, The exhaust steam recovery and discharge unit includes an exhaust steam discharge pipe (11), which is connected to the top of the deaerator (1). The exhaust steam discharge pipe (11) is connected to an exhaust steam recovery pipe (12), which is connected to the mixing unit.

3. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 2, characterized in that, The waste steam recovery pipe (12) is connected to a waste steam recovery shut-off valve (102), and the waste steam discharge pipe (11) is connected to an exhaust waste steam shut-off valve (101). The connection point between the waste steam recovery pipe (12) and the waste steam discharge pipe (11) is located between the exhaust waste steam shut-off valve (101) and the deaerator (1). The waste steam recovery shut-off valve (102) is located near the connection point between the waste steam recovery pipe (12) and the waste steam discharge pipe (11).

4. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 2, characterized in that, The mixing unit includes a demineralized water ejector (2), the inlet end of which is connected to a waste steam recovery pipe (12). The body of the waste steam recovery pipe (12) is also connected to a waste steam inlet valve (202), which is located near the demineralized water ejector (2). The inlet end of the demineralized water ejector (2) is connected to a negative pressure power assembly, and the demineralized water ejector (2) is connected to a recovery mechanism.

5. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 4, characterized in that, The negative pressure power assembly includes a demineralized water pipe (21), which is connected to the inlet end of the demineralized water ejector (2). The body of the demineralized water pipe (21) is connected to a demineralized water inlet valve (201), which is located near the demineralized water ejector (2).

6. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 4, characterized in that, The recycling mechanism includes a recycling tank (3), which is connected to a demineralized water injector (2) via a recycling pipe (31) and is connected to a conveying assembly via an output pipe (32).

7. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 6, characterized in that, The recovery pipe (31) is connected to a premixed outlet valve (203) and a condensate recovery valve (301). The premixed outlet valve (203) is located near the demineralized water ejector (2), and the condensate recovery valve (301) is connected near the recovery storage tank (3). The output pipe (32) is connected to a pump inlet valve (303).

8. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 7, characterized in that, An overflow pipe (33) is connected to the side wall of the recycling tank (3), and an overflow valve (304) is connected to the body of the overflow pipe (33). A minimum flow pipe (34) is connected to the top of the recycling tank (3). The end of the minimum flow pipe (34) away from the recycling tank (3) is connected to the conveying assembly. A minimum flow return valve (302) is connected to the body of the minimum flow pipe (34). An atmospheric pipe (35) is connected to the top of the recycling tank (3).

9. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 8, characterized in that, The conveying assembly includes a water pump (4), which is connected to an output pipe (32). The outlet of the water pump (4) is connected to a condensate return main pipe (41). The minimum flow pipe (34) is connected to the pipe body of the condensate return main pipe (41). The end of the condensate return main pipe (41) away from the water pump (4) is connected to a deaerator (1).

10. The DMTO unit low-pressure deaerator exhaust steam recovery system according to claim 9, characterized in that, The condensate return main pipe (41) is connected to a pump outlet flow control valve (401) and a condensate to deaerator inlet valve (402). The pump outlet flow control valve (401) and the condensate to deaerator inlet valve (402) are located between the deaerator (1) and the connection point of the condensate return main pipe (41) and the minimum flow pipe (34). The condensate to deaerator inlet valve (402) is located close to the deaerator (1), and the pump outlet flow control valve (401) is located close to the connection point of the condensate return main pipe (41) and the minimum flow pipe (34).

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